Atom-IDE vs Nuclide: What are the differences?

Atom-IDE: A set of optional packages to bring IDE-like functionality to Atom, created by Facebook & GitHub. A collection of Atom UIs to support language services as part of Atom IDE, designed for use with packages built on top of atom-languageclient; Nuclide: An open IDE for web and native mobile development, built on top of Atom (by Facebook). A unified developer experience for web and mobile development, built as a suite of packages on top of Atom to provide hackability and the support of an active community.

Atom-IDE belongs to "Tools for Text Editors" category of the tech stack, while Nuclide can be primarily classified under "Integrated Development Environment".

Some of the features offered by Atom-IDE are:

• Busy Signal
• Code Actions
• Code Format

On the other hand, Nuclide provides the following key features:

• Remote development. At Facebook, our web and back-end engineers work on remote development servers in our data centers. Nuclide provides a pair of packages that allow connections over SSH to a lightweight node daemon on the server, making possible remote file editing and syntax/type validation. Of course, this also works for VMs, enabling local development on HHVM, for example.
• Hack language support. The Hack codebase is one of the largest at Facebook. First-class Hack support — including syntax highlighting, type-checking, autocomplete, and click-to-symbol features — has been an important requirement on Nuclide from the start. We're also excited that the growing Hack community outside the company will be able to enjoy dedicated IDE support.
• Flow support. For both local and remote JavaScript development, Flow has brought type integrity and the ability to quickly refactor our React components and apps. As it does for Hack, Nuclide supports Flow-specific decorations and editor features in @flow-annotated files.

Atom-IDE and Nuclide are both open source tools. It seems that Nuclide with 7.99K GitHub stars and 745 forks on GitHub has more adoption than Atom-IDE with 946 GitHub stars and 101 GitHub forks.

Facebook, Instagram, and Movielala are some of the popular companies that use Nuclide, whereas Atom-IDE is used by Campus Discounts, VotePen, and W3lcome. Nuclide has a broader approval, being mentioned in 8 company stacks & 5 developers stacks; compared to Atom-IDE, which is listed in 5 company stacks and 7 developer stacks.